S. I. Smith — Crustaceans of the Atlantic Coast. 



65 



from 16-5 to 50"'"'), from various localities on the New England coast, 

 forty-seven had the normal number of epipodi, while five had epipodi 

 upon one or both of the second pair of legs. Three of the latter are 

 from the Bay of Fundy : one, a male 35'""' long, has well-developed 

 epipodi on each of the second pair of legs ; another male, 36™"' long, 

 has a short epipodus on the left side but none on the right ; the other 

 specimen, a female 47""" long, has a well-developed epipodus on the 

 right side but none on the left. The two others are from Casco Bay : 

 a female, 36"'"' long, with a short epipodus on the left side, and a male, 

 28mm long, with a rudimentary one on the right side. As the mea- 

 surements of these specimens show, the presence of the additional 

 epipodi is not a characteristic of the young. 



Hie number and position of the teeth upon the rostrum, and dorsal 

 carina of the carapax vary considerably more than is usually indicated 

 in the descriptions of the species and yet are very characteristic 

 specifically. Excej^t as a result of injury, the tip of the rostrum is 

 always acute and without teeth, and there are never teeth upon the 

 dorsal margin except near the base. The most usual formula for the 



3-1-1 2 I 2 

 •dentition is or — -^ — , the third dorsal tooth being usually just 



above the base of the rostrum ; in the series of specimens examined, 



Trans. Conn. Acad., Vol. V. 



Januart, 1879. 



